The replenishment characteristics of PFPE polar lubricant films after sliding-induced depletion arising on lubricant-coated magnetic disks have been clarified by measuring the profile changes of the lubricant film incurring in-contact sliding against a glass pin. Lightly loaded and slowly rotated test conditions were selected so that the molecular layering structure would not be strongly disturbed or destroyed. An unrecoverable phenomenon was first found to occur in which the replenishment function of lubricant films failed. This phenomenon was observed to occur when depletion depth reaches the monolayer surface or when the residual film thickness is only slightly thicker than the monolayer; when depletion depth invades the monolayer, unrecoverable features changed into recoverable features. Compared with the same tests performed using a nonpolar lubricant, the unrecoverable phenomenon was found to be peculiar to polar lubricants. In addition, replenishment characteristics were compared with diffusion characteristics currently obtained from step-boundary flow, which spreads outward from a step-shaped lubricant boundary, and the similarities and differences between the two were clarified.
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STLE/ASME 2006 International Joint Tribology Conference
October 23–25, 2006
San Antonio, Texas, USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4259-2
PROCEEDINGS PAPER
Depletion and Replenishment of Molecularly Thin Lubricant on Diamond-Like Carbon Surface of Magnetic Disks
Yasunaga Mitsuya,
Yasunaga Mitsuya
Nagoya University, Nagoya, Japan
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Hedong Zhang,
Hedong Zhang
Nagoya University, Nagoya, Japan
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Fumihiro Hayakawa,
Fumihiro Hayakawa
Tokai Rika Company, Ltd., Oguchi-cho, Japan
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Junichi Ohgi,
Junichi Ohgi
Nagoya University, Nagoya, Japan
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Kenji Fukuzawa
Kenji Fukuzawa
Nagoya University, Nagoya, Japan
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Yasunaga Mitsuya
Nagoya University, Nagoya, Japan
Hedong Zhang
Nagoya University, Nagoya, Japan
Fumihiro Hayakawa
Tokai Rika Company, Ltd., Oguchi-cho, Japan
Junichi Ohgi
Nagoya University, Nagoya, Japan
Kenji Fukuzawa
Nagoya University, Nagoya, Japan
Paper No:
IJTC2006-12086, pp. 855-861; 7 pages
Published Online:
October 2, 2008
Citation
Mitsuya, Y, Zhang, H, Hayakawa, F, Ohgi, J, & Fukuzawa, K. "Depletion and Replenishment of Molecularly Thin Lubricant on Diamond-Like Carbon Surface of Magnetic Disks." Proceedings of the STLE/ASME 2006 International Joint Tribology Conference. Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology. San Antonio, Texas, USA. October 23–25, 2006. pp. 855-861. ASME. https://doi.org/10.1115/IJTC2006-12086
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